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Proceedings Paper

Wavefront Error Compensation Capabilities Of Multi-Actuator Deformable Mirrors
Author(s): James E. Harvey; Gary M. Callahan
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Paper Abstract

The concept of a multi-actuator deformable mirror as a high-pass spatial frequency filter which operates upon the spatial frequency spectrum of the incident wavefront error allows us to apply the well-known techniques of linear systems theory to the wavefront error compensation process. The deformable mirror filter function, given by the ratio of the spatial frequency spectrum of the residual wavefront error after compensation to the spatial frequency spectrum of the uncorrected wavefront error, can be considered to be a transfer function characterizing the wavefront error compensation capabilities of the mirror. This concept has been implemented by constructing a realistic transfer function from measured actuator influence function data and incorporating the effects of several different types of wavefront sensors and control algorithms. For the special case of random wavefront errors with Gaussian statistics this transfer function can be used to predict the variance of the residual wavefront error as a function of the autocovariance length of the uncorrected wavefront error for any desired actuator density. The resulting design curves provide a simple method of determining the actuator density and stroke requirements of a deformable mirror capable of achieving a specified degree of wavefront error compensation. The actuator influence function is also explored as a variable in the design of deformable mirrors. The simple analytic model developed here is a valuable tool in the design and evaluation of wavefront error compensation systems.

Paper Details

Date Published: 8 August 1978
PDF: 8 pages
Proc. SPIE 0141, Adaptive Optical Components I, (8 August 1978); doi: 10.1117/12.956512
Show Author Affiliations
James E. Harvey, Pratt & Whitney Aircraft Group (United States)
Gary M. Callahan, Pratt & Whitney Aircraft Group (United States)

Published in SPIE Proceedings Vol. 0141:
Adaptive Optical Components I
Sandor Holly; Lawrence James, Editor(s)

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